Free Filmmaker Tool

Film & Video Aspect Ratio Calculator

Calculate aspect ratios, resolutions, crop dimensions, and letterboxing for films and videos. Enter your dimensions or choose a common cinema ratio such as 2.39:1, 1.85:1, 16:9, or 4:3.

Width (px)

Positive whole pixels

Height (px)

Positive whole pixels

Aspect ratio

16:9

1.78:1 · reduced 16:9

Widescreen / UHD / HD

1.78:1

3840 × 2160

Quick presets

Start with a filmmaker-ready frame

Click any resolution to load it into Calculate ratio, then adjust the pixels to match your delivery spec.

What is aspect ratio?

Aspect ratio describes the proportional relationship between an image's width and height. A frame can be written as a pair such as 16:9, or as a decimal such as 1.78:1; both describe essentially the same widescreen shape. Other common film aspect ratios include 1.85:1, 2.39:1, and 4:3.

Aspect ratio vs resolution

Aspect ratio is shape; resolution is the number of pixels. 1920 × 1080 and 3840 × 2160 have different resolutions but share the same 16:9 aspect ratio. The calculator keeps those ideas separate so you can choose a delivery frame without losing sight of the actual pixel dimensions.

Common film aspect ratios

Aspect ratio	Common use
2.39:1	Modern widescreen cinema and anamorphic films
2.35:1	Older CinemaScope productions
2.00:1	Univisium and modern streaming productions
1.90:1	DCI full container and some IMAX presentations
1.85:1	Common theatrical flat ratio
1.78:1 / 16:9	Television, streaming and standard video
1.66:1	European cinema
1.375:1	Academy Ratio
4:3 / 1.33:1	Classic cinema and television

What is 2.39:1?

2.39:1 is a modern theatrical scope ratio frequently associated with anamorphic widescreen presentation. Its wide frame can support expansive compositions, but the final raster depends on the working container: examples include 3840 × approximately 1607 or 4096 × approximately 1714.

2.39:1 vs 2.35:1

These ratios are close, not interchangeable. 2.35:1 is historically associated with earlier CinemaScope standards; approximately 2.39:1 reflects later theatrical practice. Always check the delivery specification when the distinction matters.

What is 1.85:1?

1.85:1 is a common theatrical flat presentation ratio. It gives a little more vertical space than scope formats and remains a useful target for cinema-oriented framing.

What is 16:9?

16 ÷ 9 is approximately 1.78, which is why 16:9 is often written as 1.78:1. It is widely used for HD, UHD, television, streaming, and general video delivery.

Cropping vs letterboxing

Cropping removes part of the source image to fill a target shape. Letterboxing preserves the image while adding horizontal bars; pillarboxing preserves it while adding vertical bars. The Fit & Crop mode shows both outcomes so you can make a deliberate framing choice.

Aspect ratio calculator FAQ

What aspect ratio is 1920 × 1080?

1920 × 1080 is 16:9, or approximately 1.78:1.

What resolution is 2.39:1 at 4K?

There is no single universal 2.39:1 4K resolution. Common working examples include 3840 × approximately 1607 and 4096 × approximately 1714; the final pixel is rounded to a whole number.

Is 2.35:1 the same as 2.39:1?

They are closely related but technically different. 2.35:1 is historically associated with earlier CinemaScope standards, while approximately 2.39:1 became the modern theatrical scope standard.

What aspect ratio is used for cinema?

There is no single cinema ratio. 1.85:1 and approximately 2.39:1 are among the most common theatrical presentation ratios, alongside other creative and exhibition formats.

What is the difference between 16:9 and 1.85:1?

16:9 is approximately 1.78:1, so it is slightly taller than 1.85:1. Framing a 1.85:1 composition in a 16:9 container can leave small bars or require a small crop, depending on the delivery workflow.

What aspect ratio should I use for a short film?

Choose based on the story, composition, exhibition requirements, and intended platforms. A short film does not have one mandatory aspect ratio.